Stone-saw.



No. 791,157. YPATENTED MAY 30, 1905."

A. H.V.MA0NUTT- I STONE SAW.

APPLIOATION I'ILED NOV. 25, 1904.

lnwziton W'tnesgea I other abrasive material used constantly bethus increase the cutting effect as the saw is UNITED STATES Patented May 30, 19051 PATENT OFFICE.

VST'ONE-SAW.

SPECIFICATION forming part of Letters Patent No. 791,157, dated. May 30, 1905.

I Application filed November 25, 1904. Serial No. 234,224.

To all whom it mayconcern:

Be it known that I, AROI-IIBALD H. MAO- N UTT, a citizen of the United States residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Stone-Saws, of which the following is a specification.

My invention relates to improvements in blades which are designed for sawing granite, marble, stone, or other material where abrasives are employed.

It consists in the construction of the saw in such a manner that the abrasive material used in conjunction therewith will be constantly fed beneath the edge of the saw to produce the greatest downward and the least ateral cutting consistent with good work.

It also consists in such a construction of the saw that the feeding devices are constantly renewed as the saw wears away and in details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure 1 is a side elevation of my improved blade. Fig. 2 is a section on line a; :23 of Fig. -1.

In the construction of my saw I employ a blade A of any suitable or desired width or material. The blade has the ends secured in a suitable frame, to which power may be applied to reciprocate the blade in the direction of the cut to be made. In the lower edge of this blade A are made a series of A-shaped openings 2, having the widest portion of the lower edge of the blade and converging upwardly to form a trapezoidal opening, of which the bottom will be the surface upon which the blade rests. These openings made in thisshape serve to feed the steel shot or' neath the lower edge of the saw-blade, and

reciprocated. In addition to the divergent sides of these openings 2 the openings are made diagonal or inclined with relation to the line of travel of the blade, as shown in the horizontal section Fig. 2. These opposite diagonal faces may be substantially parallel with each other, as shown, and the effect will be to carry the abrasive material in the line with the incline of one of the edges when the i use.

saw is moved in one direction and to the opposite side when the saw is moved in the opposite direction. The material is thus distributed over a length equal to that of these inclined edges, with the effectof more rapidly carrying the abrasive material beneath the bottom of the saw and preventing its being thrown out to the sides and wasted in unnecessary lateral abrasion. Intermediate between these openings 2 are vertical channels (shown at 3) upon opposite sides of the sawblade. These channels also serve to clear the cut of the abrasive material and cause it to be delivered below the lower edge of the saw. Intermediate between the openings 2 and the channels 3 are other trapezoidal openings, 4, similar to those shown at 2 and so located that their lower edges are below the horizontal level ofthe upper edges of the openings 2. When the saw has worn down to such apoint that the openings 2-are nearly worn out of the blade, the lower edges of the openings 4 will be cut away, and these openings 4 then take the place of the original openings 2. Above the openings 2 and intermediate between the openings 4 may be another set of similar openings, as at 5, and so on for any depth of saw-blade that it may be desired to nels are made aternately upon opposite sides of the saw and between the trapezoidal openings.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. An abrasive saw having openings made at intervals in its lower edge, said openings being divergent from the top downwardly By constructing the blade in this man- 3. An abrasive saw having openings formed in the lower edge, said openings having their front and rear edges-'inelined from vertical lines, and having said front and rear edges diagonal to the line of travel of the saw.

In testimony whereof I have hereunto set -my hand in. presence of two subscribing wit- IIGSSBS.

ARCHIBALD H. MAoNUTT. Witnesses:

JOSHUA D. OLEVENGER, W. J. ODoNoHUE. 

